Assessing morphological diversity in Ethiopian yams (Dioscorea spp.) and its correspondence with folk taxonomy
Assessing morphological diversity in Ethiopian yams (Dioscorea spp.) and its correspondence with folk taxonomy
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DOI：
10.1080/14772000.2021.1890269
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发表时间：
2021-02-26
影响因子：
1.9
通讯作者：
Mengesha, Wendawek Abebe
中科院分区：
文献类型：
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作者：
Asfaw, Bizuayehu Tesfaye;Worojie, Tsegaye Babege;Mengesha, Wendawek Abebe
本研究的目的是调查野生山药和栽培山药的形态特征多样性，并评估其与民间分类学的一致性。通过记录民间分类学中使用的每个地方种族的属性，研究了埃塞俄比亚西南部的地方分类系统。农民根据形态、生理、植物周期和块茎质量属性的不同来区分各种命名植物。用37个质量性状和13个数量性状对代表30个不同命名的地方品种的75份材料进行了评价。主成分分析表明，所使用的所有性状都有助于捕捉材料间的变异。叶位、缠绕方向、块茎类型、幼叶叶柄颜色、全翅性状、开花和叶片大小等性状有助于捕捉物种间的变异。所有其他性状都有助于捕捉同一种和不同种材料之间的差异。根据质量性状和数量性状，将75份材料分为四大类和五大类。研究表明，地方性分类与形态变异有很好的一致性，但农民低估了较低级别类群的山药多样性。我们的研究表明，材料之间存在着高度的表型多态，如果需要改进，可以加以利用。然而，关于卡宴螺属复合体中成员物种的有效性，许多问题仍然令人困惑，需要通过基于DNA的研究来解决。
This study was conducted with the objective to investigate the diversity of wild and cultivated yams based on morphological characters and to assess its correspondence with folk taxonomy. The local classification system in South-west Ethiopia was studied by recording attributes of each landrace used in the folk taxonomy. Farmers differentiate various named plants based on variations in morphological, physiological, plant cycle and tuber quality attributes. A total of 75 accessions representing 30 differently named landraces were assessed using 37 qualitative and 13 quantitative characters. Principal component analysis showed that all the traits used were useful for capturing the variability among accessions. Traits such as leaf position, twining direction, type of tuber, petiole colour on young leaves, the entire wing traits, flowering and size of leaves were useful for capturing the variability among species. All the other traits were useful for capturing the variability among accessions of the same and different species. The cluster study separated the 75 accessions into four and five major clusters based on qualitative and quantitative traits, respectively. The study indicates that the local classification corresponds well with the morphological variability, but farmers somewhat underestimate the diversity of yams at lower level taxa. Our study shows the existence of high phenotypic polymorphism among accessions, which could be exploited, if improvement need arises. Yet, regarding the validity of member species in the D. cayenensis complex, many questions remain confusing, and will need to be solved with DNA-based studies.